The New Mazda5 Diesel Engine

New Mazda5

New Mazda5

Introduced during 2010, the New Mazda5 is already a big hit with European customers, especially those with active lifestyles who drive a high mileage. Mazda now completes its new C-MAV line-up with the launch of a 1.6-litre common-rail diesel version. With this engine under the bonnet, the New Mazda5 offers customers a powerful, small-displacement turbo diesel that is frugal, affordable and fun to drive. When developing the new diesel version Mazda engineers set two key priorities - class leading, low CO2 emission levels combined with low fuel consumption and a sporty and powerful driving feel.

Because the 1.6-litre diesel has a smaller-displacement, an aluminium-alloy block and an 8-valve single camshaft (SOHC) layout, and is mated to a compact and lightweight transmission, the New Mazda5 1.6 Diesel is up to 120 kg lighter than the model it replaces, which contributes to lower fuel consumption.

The Mazda5 diesel engine is also highly efficient. Engineers optimised the mechanical parts of the 8-valve SOHC for low friction, and employed highly-efficient Piezo injectors, all of which contribute to superior combustion efficiency. As a result, the New Mazda5 1.6-litre diesel produces 5ps more power than the 2.0-litre diesel (standard power version) it replaces, while using 14.8 per cent less fuel and producing 13.2 per cent less CO2. It will appeal especially to customers with active lifestyles looking for a flexible, do-it-all C-MAV with affordable operating costs and superior emissions performance.

Not only is the new diesel cleaner, it is also lighter than the engine it replaces thanks to it's compact size, aluminium block and SOHC layout, with big benefits for fuel consumption. Overall, the Mazda5 1.6 Diesel is 120 kg lighter, uses only 5.2 litres per 100km of fuel and achieves Euro V compliance. It does this in various ways, including using a low compression ratio of only 16:1 - which lowers the combustion temperature - and a highly-efficient exhaust gas recirculation (EGR) cooler and EGR cooler bypass system. This enables the engine to warm up faster and reach peak combustion efficiency quicker from cold.

This 8-valve SOHC layout is also less complicated with fewer moving parts than a DOHC system, which means that valve train friction is reduced and NVH performance of the engine is optimised. This included enhancing the precision of the injection system by employing new Piezo injectors that inject fuel at up to 1,600 bar. These injectors allow more precise injection control and multi-point injection to realise smoother combustion. These features - coupled to the New Mazda5's already extensive sound insulation measures - result in a smooth-running diesel C-MAV that is comfortable to drive in every situation.

A New Turbocharger With Higher Output

The variable-geometry turbocharger (VGT) helps the engine produce a maximum torque of 270 Nm available across a wider rev range (between 1,750 and 2,500rpm) for improved day-to-day driving. Together with a maximum power output of 85 kW/115 PS at just 3,600rpm, the generous torque supports a dynamic yet comfortable and easy-to-control performance feel; and allows Mazda5 to reach top speed of 112mph in sixth gear.

Clean-Running Maintenance-Free DPF

Mazda5's new diesel also introduces a new maintenance-free diesel particulate filter (DPF) system. The new 1.6-litre diesel uses an oxidation catalyst to increase the exhaust gas temperature and improve particulate combustion. This is user-friendly and also reduces costs for the customer.

Published 19 January 2011 Staff

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